Method of coating material



June17;"1930 c. HALL 7 5 METHOD OF COATING MATERIAL Filed May 4, 1928.

//7 vehfor fdf/ C H0 In order to apply pulp to the core as it passes over the drum 12, the liquid within the drum is maintained at a lower level than that of the pulp mixture in the trough 13, as indicated by the dotted lines A and B respectively. This difference in' level is maintained by a syphonpipe 21 which has its inlet opening submerged in the liquid within the drum 12 and its discharge through the tubular axle 18. A continuous circulation of the'pulp mixture is maintained in the through 13 by feeding the pulp mixture from a supply tank (not shown) into the trough 13 by means of a pipe 23, and out of the said trough through a pipe 24 into a receiving tank (not shown) from which it is pumped back into the supply tank in any suitable manner. As the'drum 12 is rotated within the trough 13 the liquid in the tank passes through the wire mesh 17 straining the pulp onto the outer surface thereof and applying pulp to the core supported thereon. The drum 12 is rotated in a counter-clockwise direction (Fig. 1) and the core with the pulp applied thereon passes from the top of the drum onto a felt covered roll 26 which is disposed in contact with the wire mesh 17. The periphery of the roll 26 has a foraminous portion 27 which is covered by a fine wire mesh 28 (Fig. 2) and as the core and its attached pulp passes between the drum 12- and the roll 26, the free liquid, so to speak, in the pul mixture is squeezed out artially through t e foraminous portion oft e drum 12 and partially through the felt and the foraminous portion of the roll 26. The partially dried pulp adheres to the felt of the roll-26 in the form of a ribbon 31 with the core centrally located therein as illustrated in Fig. 3. 7

After passing partially around the felt covered roll 26 the core with its attached ribjecting edges of the pulp ribbon around the core and around each other. The appearance of the coating after it is first acted upon by the forming mechanism is illustrated in Fig.

' 5 and its appearance after the forming operation has been completed-is illustrated in Fig. 6. The forming mechanism 30 may be of the type fully illustrated and described in Patent No. 1,615,416 to H. G.. Walker and A. T. March, and reference is made to such patent for a detailed description ofthis mechanism. v

After being drawn through the forming mechanism the core with its formed fibrous coating maybe subjected to a drying operareceive the core, and provided with guides (not shown) for directing the core over first one drum and then the other until ithas traversed all of the grooves of both drums.

'lVhen the drying operation is completed, the pulp coated core is drawn from the drying means over a wick 33 submerged in a liquid, such as water, contained in a receptacle 34. Due to the rapid absorption of the liquid by the pulp fibres, the pulpous coating beconies thoroughly saturated with the liquid as the core passes over the wick 33. The core with the saturated coating is then passed over an idler roll 37 and around a drum 38 which is partially submerged in a coating substance contained in a tank 40. Various kinds of coating substances, such as cellulose acetate, cellulose nitrate, varnishes, etc., may be used in accordance with the particular character of surface coating which is to be applied upon the pulp coating. 7 In practice satisfactory and beneficial results have been obtained when the material to be coated is first saturated with a liquid,

such as water, which is anon-solvent for the coating substance and is then immersed in a solution of cellulose acetate, which does not dissolve in water.

As the pulp covered core passes through pulp coating. The core thuscoated is then subjected to a drying process to remove the excess liquid therefrom.

Asillustrated in the drawing, the coated wire is drawn from the coating substance and passed upwardly through a drying oven 42, over an idler pulley 43, a nd then downwardly and over an idler pulley 44 from which it is stored upon a suitable take-up stance to be formed upon the surface of the reel 45. Although itshould be understood that the core may be passed up and down through the oven any number of times desired, for the sake. of simplicity only a single pass is illustrated. The oven 42 maybe heated by steam ipes 46 or by any other suitable means.- 11 some instances it ma be found necessary to pass the core throu and stored upon suitable take-up reels (not shown) after which it may be unwound from core may be drawn from .the drying means the'take-up reels and a surface coating applied thereon in the mannerhereinbeforc described.

What is-claimed is:

Y 1. A'method of applying a coating upon a fibrous material, consisting in first subjecting the material to water, and then subject- 'ing the material'to cellulose acetate.

2. A method of applying a surface coating upon a fibrous material, consisting in subject- 'ing'the material to water, subjecting the material to cellulose acetate, and then removing the excess water fromthe material,

3. A method ofcoatinga core cons sting I in applying a pulp coating to the core, subwater whereby a surface coating is formed liquid therefrom.

j ecting the pulpcoatingto a liquid, andthen subjecting the'pulp coating to a coating substance which is insoluble in the liquid whereby a surface'coating is formed upon said pulp coating. j

4. A method of coating a core, consisting subjecting the core toa liquid con'- taining pulp in such manner that pulp is applied thereto, and then applying a surface coating upon the pulp by firstsubjecting it to a liquid and .then subjecting it to a coating substance which is insoluble in the liquid. A

5 A method of coating a core consisting in applying a pulp coatingto the core,

subjecting the pulp coating to 'a liquid, subjecting the pulp coating 'to a coating substance which is insoluble in the liquid whereby a surface coating is formed upon said pulp coating, and then treating the pulp coating so asto remove the excess 6. A methqd of coating a core, consisting in applying .a pulp coating to the core, subjecting the pulp coating to a liquid, and then subjecting the pulp coating to a waterproofing substance which is insoluble in the liquid whereby a surface coating is formed upon said pulp coating.

7. A methodof coating a core, consisting in applying a pulp coating to the core, saturating the coating with water, 'and then subjecting the saturated coating to a waterproofing substance which is insoluble in upon the pulp coating.

8. A method of coating acore, consisting in subjecting the core to a liquid containing pulp in such manner that pulp is applied thereto, applying a surface coating upon the pulp by first subjecting it to a liquid andthen, subjecting the pulp to a coating substance which is insoluble in the liquid, and then removing the excess liquid from the pulp. 9. A methqd in subjecting the coreto a liquid containing pulp in such manner that pulp is appliedthereto, to constitute a/coating therefor, subjecting vent for cellulose acetate, subjecting the moving the excess liquid therefrom.

' LO A method of coating a core in strand forin, consisting ;in subjecting, the core to a liquid containing pulp in'such manner that pulp is applied thereto and caused to cling to the core solely byan intermingling of the forming the pulp around the core the coating to a liquid which is anon-sol coating to cellulose" acetate, and then re- T pulp fibres,forming the pulp around the core to constitute a coating thereforhaving a curved outer surface, saturating the pulp coating with Water, immersing the saturated pulp coatin in cellulose acetate, and then subjecting t e coating to a drying process to remove the excesswater.

11. A method of coating a core in strand form," consisting in' applying unfinished paper to the core,, completing the fabrica-' tion of the unfinished paper on the core to constitute a coating therefor, saturating the 13. A method of producing an insulated conductor, consisting in applying a fibrous pulp covering to the conductor, securing the pulp covering to the core by the intermingling of the fibres thereof, wetting the covering with a non-solvent of cellulose acetate, applying cellulose acetate to the wet covering, and drying the covering.

In witness whereof, I hereunto subscribe my name this 19th day of April A. D., 1928. EARL C. HALL.

of coating a core, consisting 

